The highest correlation among IQ scores is for
A) identical twins.
B) parent and child.
C) non-twin siblings.
D) foster parent and child.
E) fraternal twins.

Question

Quizplus · Accepted Answer

The highest correlation among IQ scores is for identical twins because they share nearly all of their DNA and therefore have very similar genetic backgrounds. Studies have shown that the correlation for IQ scores between identical twins can be as high as 0.86, whereas the correlation for fraternal twins is lower at around 0.6. Correlations for parent and child, non-twin siblings, and foster parent and child are generally lower than those for identical twins.

The Highest Correlation Among IQ Scores Is for